const QPen AbstractScopeWidget::penLighter(QBrush(QColor(225, 225, 250, 225)), 1, Qt::SolidLine);
const QPen AbstractScopeWidget::penDark(QBrush(QColor(0, 0, 20, 250)), 1, Qt::SolidLine);
const QPen AbstractScopeWidget::penDarkDots(QBrush(QColor(0, 0, 20, 250)), 1, Qt::DotLine);
+const QPen AbstractScopeWidget::penBackground(QBrush(dark2), 1, Qt::SolidLine);
const QString AbstractScopeWidget::directions[] = {"North", "Northeast", "East", "Southeast"};
static const QPen penLighter;
static const QPen penDark;
static const QPen penDarkDots;
+ static const QPen penBackground;
static const QString directions[]; // Mainly for debug output
AbstractAudioScopeWidget::AbstractAudioScopeWidget(bool trackMouse, QWidget *parent) :
AbstractScopeWidget(trackMouse, parent),
- m_audioFrame(),
- m_freq(0),
- m_nChannels(0),
- m_nSamples(0),
- m_newData(0)
+ m_freq(0),
+ m_nChannels(0),
+ m_nSamples(0),
+ m_audioFrame(),
+ m_newData(0)
{
}
const QVector<int16_t> audioFrame, const int freq, const int num_channels, const int num_samples,
const int newData) = 0;
-private:
- QVector<int16_t> m_audioFrame;
int m_freq;
int m_nChannels;
int m_nSamples;
+
+private:
+ QVector<int16_t> m_audioFrame;
QAtomicInt m_newData;
private slots:
// Enables debugging, like writing a GNU Octave .m file to /tmp
//#define DEBUG_AUDIOSPEC
+
#ifdef DEBUG_AUDIOSPEC
-#include <fstream>
#include <QDebug>
-bool fileWritten = false;
#endif
#define MIN_DB_VALUE -120
#define MIN_FREQ_VALUE 1000
AudioSpectrum::AudioSpectrum(QWidget *parent) :
- AbstractAudioScopeWidget(false, parent),
- m_fftTools()
+ AbstractAudioScopeWidget(true, parent),
+ m_fftTools(),
+ m_lastFFT(),
+ m_lastFFTLock(1)
{
ui = new Ui::AudioSpectrum_UI;
ui->setupUi(this);
bool b = true;
b &= connect(m_aResetHz, SIGNAL(triggered()), this, SLOT(slotResetMaxFreq()));
b &= connect(ui->windowFunction, SIGNAL(currentIndexChanged(int)), this, SLOT(forceUpdate()));
+ b &= connect(this, SIGNAL(signalMousePositionChanged()), this, SLOT(forceUpdateHUD()));
Q_ASSERT(b);
m_fftTools.fftNormalized(audioFrame, 0, num_channels, freqSpectrum, windowType, fftWindow, 0);
+ // Store the current FFT window (for the HUD) and run the interpolation
+ // for easy pixel-based dB value access
+ QVector<float> dbMap;
+ m_lastFFTLock.acquire();
+ m_lastFFT = QVector<float>(fftWindow/2);
+ memcpy(m_lastFFT.data(), &(freqSpectrum[0]), fftWindow/2 * sizeof(float));
+
+ uint right = ((float) m_freqMax)/(m_freq) * (m_lastFFT.size() - 1);
+ dbMap = interpolatePeakPreserving(m_lastFFT, m_innerScopeRect.width(), 0, right, -120);
+ m_lastFFTLock.release();
+
+
// Draw the spectrum
QImage spectrum(m_scopeRect.size(), QImage::Format_ARGB32);
spectrum.fill(qRgba(0,0,0,0));
const uint h = m_innerScopeRect.height();
const uint leftDist = m_innerScopeRect.left() - m_scopeRect.left();
const uint topDist = m_innerScopeRect.top() - m_scopeRect.top();
- float f;
- float x;
- float x_prev = 0;
- float val;
- int xi;
- for (uint i = 0; i < w; i++) {
-
- // i: Pixel coordinate
- // f: Target frequency
- // x: Frequency array index (float!) corresponding to the pixel
- // xi: floor(x)
-
- f = i/((float) w-1.0) * m_freqMax;
- x = 2*f/freq * (fftWindow/2 - 1);
- xi = (int) floor(x);
-
- if (x >= fftWindow/2) {
- break;
- }
-
- // Use linear interpolation in order to get smoother display
- if (i == 0 || xi == fftWindow/2-1) {
- // ... except if we are at the left or right border of the display or the spectrum
- val = freqSpectrum[xi];
- } else {
+ int yMax;
- if (freqSpectrum[xi] > freqSpectrum[xi+1]
- && x_prev < xi) {
- // This is a hack to preserve peaks.
- // Consider f = {0, 100, 0}
- // x = {0.5, 1.5}
- // Then x is 50 both times, and the 100 peak is lost.
- // Get it back here for the first x after the peak.
- val = freqSpectrum[xi];
- } else {
- val = (xi+1 - x) * freqSpectrum[xi]
- + (x - xi) * freqSpectrum[xi+1];
- }
+ for (uint i = 0; i < w; i++) {
+ yMax = (dbMap[i] - m_dBmin) / (m_dBmax-m_dBmin) * (h-1);
+ if (yMax < 0) {
+ yMax = 0;
+ } else if (yMax >= (int)h) {
+ yMax = h-1;
}
-
- // freqSpectrum values range from 0 to -inf as they are relative dB values.
- for (uint y = 0; y < h*(1 - (val - m_dBmax)/(m_dBmin-m_dBmax)) && y < h; y++) {
+ for (int y = 0; y < yMax && y < (int)h; y++) {
spectrum.setPixel(leftDist + i, topDist + h-y-1, qRgba(225, 182, 255, 255));
}
-
- x_prev = x;
}
emit signalScopeRenderingFinished(start.elapsed(), 1);
-#ifdef DEBUG_AUDIOSPEC
- if (!fileWritten || true) {
- std::ofstream mFile;
- mFile.open("/tmp/freq.m");
- if (!mFile) {
- qDebug() << "Opening file failed.";
- } else {
- mFile << "val = [ ";
-
- for (int sample = 0; sample < 256; sample++) {
- mFile << data[sample] << " ";
- }
- mFile << " ];\n";
-
- mFile << "freq = [ ";
- for (int sample = 0; sample < 256; sample++) {
- mFile << freqData[sample].r << "+" << freqData[sample].i << "*i ";
- }
- mFile << " ];\n";
-
- mFile.close();
- fileWritten = true;
- qDebug() << "File written.";
- }
- } else {
- qDebug() << "File already written.";
- }
-#endif
return spectrum;
} else {
const uint topDist = m_innerScopeRect.top() - m_scopeRect.top();
const uint leftDist = m_innerScopeRect.left() - m_scopeRect.left();
const uint dbDiff = ceil((float)minDistY/m_innerScopeRect.height() * (m_dBmax-m_dBmin));
+ const int mouseX = m_mousePos.x() - m_innerScopeRect.left();
+ const int mouseY = m_mousePos.y() - m_innerScopeRect.top();
QImage hud(m_scopeRect.size(), QImage::Format_ARGB32);
hud.fill(qRgba(0,0,0,0));
}
}
+ if (m_mouseWithinWidget && mouseX < m_innerScopeRect.width()-1) {
+ davinci.setPen(AbstractScopeWidget::penThin);
+
+ x = leftDist + mouseX;
+
+ float db = 0;
+ float freq = ((float) mouseX)/(m_innerScopeRect.width()-1) * m_freqMax;
+ bool drawDb = false;
+
+ m_lastFFTLock.acquire();
+ if (m_lastFFT.size() > 0) {
+ uint right = ((float) m_freqMax)/(m_freq) * (m_lastFFT.size() - 1);
+ QVector<float> dbMap = AudioSpectrum::interpolatePeakPreserving(m_lastFFT, m_innerScopeRect.width(), 0, right, -120);
+
+ db = dbMap[mouseX];
+ y = topDist + m_innerScopeRect.height()-1 - (dbMap[mouseX] - m_dBmin) / (m_dBmax-m_dBmin) * (m_innerScopeRect.height()-1);
+
+ if (y < (int)topDist + m_innerScopeRect.height()-1) {
+ drawDb = true;
+ davinci.drawLine(x, y, leftDist + m_innerScopeRect.width()-1, y);
+ }
+ } else {
+ y = topDist + mouseY;
+ }
+ m_lastFFTLock.release();
+
+ if (y > (int)topDist + mouseY) {
+ y = topDist+ mouseY;
+ }
+ davinci.drawLine(x, y, x, topDist + m_innerScopeRect.height()-1);
+
+ if (drawDb) {
+ QPoint dist(20, -20);
+ QRect rect(
+ leftDist + mouseX + dist.x(),
+ topDist + mouseY + dist.y(),
+ 100,
+ 40
+ );
+ if (rect.right() > (int)leftDist + m_innerScopeRect.width()-1) {
+ // Mirror the rectangle at the y axis to keep it inside the widget
+ rect = QRect(
+ rect.topLeft() - QPoint(rect.width() + 2*dist.x(), 0),
+ rect.size());
+ }
+
+ QRect textRect(
+ rect.topLeft() + QPoint(12, 4),
+ rect.size()
+ );
+
+ davinci.fillRect(rect, AbstractScopeWidget::penBackground.brush());
+ davinci.setPen(AbstractScopeWidget::penLighter);
+ davinci.drawRect(rect);
+ davinci.drawText(textRect, QString(
+ i18n("%1 dB", QString("%1").arg(db, 0, 'f', 2))
+ + "\n"
+ + i18n("%1 kHz", QString("%1").arg(freq/1000, 0, 'f', 2))));
+ }
+
+ }
+
emit signalHUDRenderingFinished(start.elapsed(), 1);
return hud;
}
+const QVector<float> AudioSpectrum::interpolatePeakPreserving(const QVector<float> in, const uint targetSize, uint left, uint right, float fill)
+{
+ if (right == 0) {
+ right = in.size()-1;
+ }
+ Q_ASSERT(targetSize > 0);
+ Q_ASSERT(left < right);
+
+ QVector<float> out(targetSize);
+
+
+ float x;
+ float x_prev = 0;
+ int xi;
+ uint i;
+ for (i = 0; i < targetSize; i++) {
+
+ // i: Target index
+ // x: Interpolated source index (float!)
+ // xi: floor(x)
+
+ // Transform [0,targetSize-1] to [left,right]
+ x = ((float) i) / (targetSize-1) * (right-left) + left;
+ xi = (int) floor(x);
+
+ if (x > in.size()-1) {
+ // This may happen if right > in.size()-1; Fill the rest of the vector
+ // with the default value now.
+ break;
+ }
+
+
+ // Use linear interpolation in order to get smoother display
+ if (i == 0 || i == targetSize-1) {
+ // ... except if we are at the left or right border of the display or the spectrum
+ out[i] = in[xi];
+ } else {
+ if (in[xi] > in[xi+1]
+ && x_prev < xi) {
+ // This is a hack to preserve peaks.
+ // Consider f = {0, 100, 0}
+ // x = {0.5, 1.5}
+ // Then x is 50 both times, and the 100 peak is lost.
+ // Get it back here for the first x after the peak (which is at xi).
+ // (x is the first after the peak if the previous x was smaller than floor(x).)
+ out[i] = in[xi];
+ } else {
+ out[i] = (xi+1 - x) * in[xi]
+ + (x - xi) * in[xi+1];
+ }
+ }
+ x_prev = x;
+ }
+ // Fill the rest of the vector if the right border exceeds the input vector.
+ for (; i < targetSize; i++) {
+ out[i] = fill;
+ }
+
+ return out;
+}
+
+
#ifdef DEBUG_AUDIOSPEC
#undef DEBUG_AUDIOSPEC
#endif
QAction *m_aResetHz;
FFTTools m_fftTools;
+ QVector<float> m_lastFFT;
+ QSemaphore m_lastFFTLock;
/** Contains the plot only; m_scopeRect contains text and widgets as well */
QRect m_innerScopeRect;
/** The user has chosen a custom frequency. */
bool m_customFreq;
+ /** This is linear interpolation with the special property that it preserves peaks, which is required
+ for e.g. showing correct Decibel values (where the peak values are of interest).
+ Consider f = {0, 100, 0}
+ x = {0.5, 1.5}: With default linear interpolation x0 and x1 would both be mapped to 50.
+ This function maps x1 (the first position after the peak) to 100.
+
+ @param in The source vector containing the data
+ @param targetSize Number of interpolation nodes between ...
+ @param left the left array index in the in-vector and ...
+ @param right the right array index (both inclusive).
+ @param fill If right lies outside of the array bounds (which is perfectly fine here) then this value
+ will be used for filling the missing information.
+ */
+ static const QVector<float> interpolatePeakPreserving(const QVector<float> in, const uint targetSize, uint left = 0, uint right = 0, float fill = 0.0);
private slots:
#include "ffttools.h"
+// Uncomment for debugging
//#define DEBUG_FFTTOOLS
+
#ifdef DEBUG_FFTTOOLS
#include <QDebug>
#include <QTime>
+#include <fstream>
#endif
FFTTools::FFTTools() :
std::fill(&data[numSamples], &data[windowSize-1], 0);
}
// Normalize signals to [0,1] to get correct dB values later on
- for (int i = 0; i < numSamples && i < windowSize; i++) {
+ for (uint i = 0; i < numSamples && i < windowSize; i++) {
// Performance note: Benchmarking has shown that using the if/else inside the loop
// does not do noticeable worse than keeping it outside (perhaps the branch predictor
// is good enough), so it remains in there for better readability.
// Logarithmic scale: 20 * log ( 2 * magnitude / N ) with magnitude = sqrt(r² + i²)
// with N = FFT size (after FFT, 1/2 window size)
- for (int i = 0; i < windowSize/2; i++) {
+ for (uint i = 0; i < windowSize/2; i++) {
// Logarithmic scale: 20 * log ( 2 * magnitude / N ) with magnitude = sqrt(r² + i²)
// with N = FFT size (after FFT, 1/2 window size)
freqSpectrum[i] = 20*log(pow(pow(fabs(freqData[i].r * windowScaleFactor),2) + pow(fabs(freqData[i].i * windowScaleFactor),2), .5)/((float)windowSize/2.0f))/log(10);;
}
+
+#ifdef DEBUG_FFTTOOLS
+ std::ofstream mFile;
+ mFile.open("/tmp/freq.m");
+ if (!mFile) {
+ qDebug() << "Opening file failed.";
+ } else {
+ mFile << "val = [ ";
+
+ for (int sample = 0; sample < 256; sample++) {
+ mFile << data[sample] << " ";
+ }
+ mFile << " ];\n";
+
+ mFile << "freq = [ ";
+ for (int sample = 0; sample < 256; sample++) {
+ mFile << freqData[sample].r << "+" << freqData[sample].i << "*i ";
+ }
+ mFile << " ];\n";
+
+ mFile.close();
+ qDebug() << "File written.";
+ }
+#endif
+
#ifdef DEBUG_FFTTOOLS
qDebug() << "Calculated FFT in " << start.elapsed() << " ms.";
#endif
m_aResetHz = new QAction(i18n("Reset maximum frequency to sampling rate"), this);
+ m_aGrid = new QAction(i18n("Draw grid"), this);
+ m_aGrid->setCheckable(true);
m_menu->addSeparator();
m_menu->addAction(m_aResetHz);
+ m_menu->addAction(m_aGrid);
m_menu->removeAction(m_aRealtime);
writeConfig();
delete m_aResetHz;
+ delete m_aGrid;
}
void Spectrogram::readConfig()
ui->windowSize->setCurrentIndex(scopeConfig.readEntry("windowSize", 0));
ui->windowFunction->setCurrentIndex(scopeConfig.readEntry("windowFunction", 0));
+ m_aGrid->setChecked(scopeConfig.readEntry("drawGrid", true));
m_dBmax = scopeConfig.readEntry("dBmax", 0);
m_dBmin = scopeConfig.readEntry("dBmin", -70);
m_freqMax = scopeConfig.readEntry("freqMax", 0);
scopeConfig.writeEntry("windowSize", ui->windowSize->currentIndex());
scopeConfig.writeEntry("windowFunction", ui->windowFunction->currentIndex());
+ scopeConfig.writeEntry("drawGrid", m_aGrid->isChecked());
scopeConfig.writeEntry("dBmax", m_dBmax);
scopeConfig.writeEntry("dBmin", m_dBmin);
const uint textDistY = 25;
const uint topDist = m_innerScopeRect.top() - m_scopeRect.top();
const uint leftDist = m_innerScopeRect.left() - m_scopeRect.left();
- const uint mouseX = m_mousePos.x() - m_innerScopeRect.left();
- const uint mouseY = m_mousePos.y() - m_innerScopeRect.top();
+ const int mouseX = m_mousePos.x() - m_innerScopeRect.left();
+ const int mouseY = m_mousePos.y() - m_innerScopeRect.top();
bool hideText;
QImage hud(m_scopeRect.size(), QImage::Format_ARGB32);
// Frame display
- for (int frameNumber = 0; frameNumber < m_innerScopeRect.height(); frameNumber += minDistY) {
- y = topDist + m_innerScopeRect.height()-1 - frameNumber;
- hideText = m_mouseWithinWidget && abs(y - mouseY) < textDistY && mouseY < m_innerScopeRect.height() && mouseX < m_innerScopeRect.width();
-
- davinci.drawLine(leftDist, y, leftDist + m_innerScopeRect.width()-1, y);
- if (!hideText) {
- davinci.drawText(leftDist + m_innerScopeRect.width() + textDistX, y + 6, QVariant(frameNumber).toString());
+ if (m_aGrid->isChecked()) {
+ for (int frameNumber = 0; frameNumber < m_innerScopeRect.height(); frameNumber += minDistY) {
+ y = topDist + m_innerScopeRect.height()-1 - frameNumber;
+ hideText = m_mouseWithinWidget && abs(y - mouseY) < (int)textDistY && mouseY < m_innerScopeRect.height() && mouseX < m_innerScopeRect.width();
+
+ davinci.drawLine(leftDist, y, leftDist + m_innerScopeRect.width()-1, y);
+ if (!hideText) {
+ davinci.drawText(leftDist + m_innerScopeRect.width() + textDistX, y + 6, QVariant(frameNumber).toString());
+ }
}
}
// Draw a line through the mouse position with the correct Frame number
if (y < 0) {
y = 0;
}
- if (y > topDist + m_innerScopeRect.height()-1 - 30) {
+ if (y > (int)topDist + m_innerScopeRect.height()-1 - 30) {
y = topDist + m_innerScopeRect.height()-1 - 30;
}
davinci.drawLine(x, topDist + mouseY, leftDist + m_innerScopeRect.width()-1, topDist + mouseY);
const int rightBorder = leftDist + m_innerScopeRect.width()-1;
x = 0;
y = topDist + m_innerScopeRect.height() + textDistY;
- for (uint hz = 0; x <= rightBorder; hz += hzDiff) {
- davinci.setPen(AbstractScopeWidget::penLight);
- x = leftDist + (m_innerScopeRect.width()-1) * ((float)hz)/m_freqMax;
+ if (m_aGrid->isChecked()) {
+ for (uint hz = 0; x <= rightBorder; hz += hzDiff) {
+ davinci.setPen(AbstractScopeWidget::penLight);
+ x = leftDist + (m_innerScopeRect.width()-1) * ((float)hz)/m_freqMax;
- // Hide text if it would overlap with the text drawn at the mouse position
- hideText = m_mouseWithinWidget && abs(x-(leftDist + mouseX + 18)) < minDistX && mouseX < m_innerScopeRect.width();
+ // Hide text if it would overlap with the text drawn at the mouse position
+ hideText = m_mouseWithinWidget && abs(x-(leftDist + mouseX + 20)) < (int) minDistX + 16 && mouseX < m_innerScopeRect.width();
- if (x <= rightBorder) {
- davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()+6);
- }
- if (x+textDistY < leftDist + m_innerScopeRect.width()) {
- // Only draw the text label if there is still enough room for the final one at the right.
- if (!hideText) {
- davinci.drawText(x-4, y, QVariant(hz/1000).toString());
+ if (x <= rightBorder) {
+ davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()+6);
+ }
+ if (x+textDistY < leftDist + m_innerScopeRect.width()) {
+ // Only draw the text label if there is still enough room for the final one at the right.
+ if (!hideText) {
+ davinci.drawText(x-4, y, QVariant(hz/1000).toString());
+ }
}
- }
- if (hz > 0) {
- // Draw finer lines between the main lines
- davinci.setPen(AbstractScopeWidget::penLightDots);
- for (uint dHz = 3; dHz > 0; dHz--) {
- x = leftDist + m_innerScopeRect.width() * ((float)hz - dHz * hzDiff/4.0f)/m_freqMax;
- if (x > rightBorder) {
- break;
+ if (hz > 0) {
+ // Draw finer lines between the main lines
+ davinci.setPen(AbstractScopeWidget::penLightDots);
+ for (uint dHz = 3; dHz > 0; dHz--) {
+ x = leftDist + m_innerScopeRect.width() * ((float)hz - dHz * hzDiff/4.0f)/m_freqMax;
+ if (x > rightBorder) {
+ break;
+ }
+ davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()-1);
}
- davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()-1);
}
}
- }
- // Draw the line at the very right (maximum frequency)
- x = leftDist + m_innerScopeRect.width()-1;
- hideText = m_mouseWithinWidget && abs(x-(leftDist + mouseX + 24)) < minDistX && mouseX < m_innerScopeRect.width();
- davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()+6);
- if (!hideText) {
- davinci.drawText(x-10, y, i18n("%1 kHz").arg((double)m_freqMax/1000, 0, 'f', 1));
+ // Draw the line at the very right (maximum frequency)
+ x = leftDist + m_innerScopeRect.width()-1;
+ hideText = m_mouseWithinWidget && abs(x-(leftDist + mouseX + 30)) < (int) minDistX && mouseX < m_innerScopeRect.width();
+ davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()+6);
+ if (!hideText) {
+ davinci.drawText(x-10, y, i18n("%1 kHz").arg((double)m_freqMax/1000, 0, 'f', 1));
+ }
}
// Draw a line through the mouse position with the correct frequency label
davinci.setPen(AbstractScopeWidget::penThin);
x = leftDist + mouseX;
davinci.drawLine(x, topDist, x, topDist + m_innerScopeRect.height()+6);
- davinci.drawText(x-10, y, i18n("%1 kHz").arg((double)(m_mousePos.x()-m_innerScopeRect.left())/m_innerScopeRect.width() * m_freqMax/1000, 0, 'f', 1));
+ davinci.drawText(x-10, y, i18n("%1 kHz")
+ .arg((double)(m_mousePos.x()-m_innerScopeRect.left())/m_innerScopeRect.width() * m_freqMax/1000, 0, 'f', 2));
}
// Draw the dB brightness scale
float val;
davinci.setPen(AbstractScopeWidget::penLighter);
- for (y = topDist; y < topDist + m_innerScopeRect.height(); y++) {
+ for (y = topDist; y < (int)topDist + m_innerScopeRect.height(); y++) {
val = 1-((float)y-topDist)/(m_innerScopeRect.height()-1);
int col = qRgba(255, 255, 255, 255.0 * val);
- for (x = leftDist-6; x >= leftDist-13; x--) {
+ for (x = leftDist-6; x >= (int)leftDist-13; x--) {
hud.setPixel(x, y, col);
}
}
Ui::Spectrogram_UI *ui;
FFTTools m_fftTools;
QAction *m_aResetHz;
+ QAction *m_aGrid;
QList<QVector<float> > m_fftHistory;
QImage m_fftHistoryImg;
projects / kdenlive / commitdiff